Multifunctional four-limb chest fixing brace

The utility model discloses a multifunctional four-limb chest fixing brace, which comprises a large-size shell-type splint, a fixing bolt and a plurality of elastic bands, a first inner groove is formed in the large-size shell-type splint, a medium-size shell-type splint is movably arranged in the first inner groove, and the medium-size shell-type splint is in sliding connection with the inner side wall of the first inner groove; a second inner groove is formed in the middle shell type clamping plate, a small shell type clamping plate is movably arranged in the second inner groove, and the small shell type clamping plate is slidably connected with the inner side wall of the second inner groove. A first limiting mechanism is arranged in the middle shell type clamping plate, the thigh and the shank or the upper arm and the forearm of a human body can be rigidly fixed by combining the two shell type clamping plates of the same specification, and the length of the middle shell type clamping plate and the length o